Terminal apparatus, communication system, and communication method

Abstract

A terminal apparatus includes a downlink transceiver that receives downlink data via a base station governing a first cell and exchanges with the base station governing the first cell, control information that is for receiving the downlink data; and an uplink transceiver that transmits uplink data via a base station governing a second cell that is different from the first cell and exchanges with the base station governing the second cell, control information that is for transmitting the uplink data.

What is claimed is: 
     
       1. A terminal apparatus comprising:
 a downlink transceiver that receives downlink data via a base station governing a first cell and exchanges with the base station governing the first cell, control information that is for receiving the downlink data; 
 an uplink transceiver that transmits uplink data via a base station governing a second cell that is different from the first cell and exchanges with the base station governing the second cell, control information that is for transmitting the uplink data; 
 a controller that switches between communication comprising a downlink control channel, a downlink data channel, and an uplink control channel by the downlink transceiver and communication comprising a downlink control channel, an uplink data channel, and an uplink control channel by the uplink transceiver, according to time division; and 
 an interference power measurer configured to measure downlink interference power for each wireless frame into which wireless resources are time divided, 
 wherein time resources are allocated for communication with the base station governing the first cell and for communication with the base station governing the second cell, based on interference power of communication by the base station governing the first cell and interference power of communication by the base station governing the second cell. 
 
     
     
       2. A communication system comprising:
 a base station that governs a first cell, transmits downlink data to a terminal apparatus and exchanges with the terminal apparatus, control information for transmitting the downlink data; and 
 a base station that governs a second cell that is different from the first cell, receives uplink data from the terminal apparatus, and exchanges with the terminal apparatus, control information for receiving the uplink data, wherein 
 the base station governing the first cell and the base station governing the second cell communicate with the terminal apparatus by time division; 
 the terminal apparatus comprising: 
 a controller that switches between communication comprising a downlink control channel, a downlink data channel, and an uplink control channel by a downlink transceiver and communication comprising a downlink control channel, an uplink data channel, and an uplink control channel by an uplink transceiver, according to time division; and 
 an interference power measurer configured to measure downlink interference power for each wireless frame into which wireless resources are time divided, 
 wherein time resources are allocated for communication with the base station governing the first cell and for communication with the base station governing the second cell, based on interference power of communication by the base station governing the first cell and interference power of communication by the base station governing the second cell. 
 
     
     
       3. The communication system according to  claim 2 , wherein
 the terminal apparatus transmits to a base station with which the terminal apparatus is communicating, a request signal requesting reception of the downlink data via the base station governing the first cell and transmission of the uplink data via the base station governing the second cell; and 
 the base station with which the terminal apparatus is communicating, respectively controls based on the request signal transmitted from the terminal apparatus, the base station governing the first cell to transmit the downlink data to the terminal apparatus, and the base station governing the second cell to receive the uplink data from the terminal apparatus. 
 
     
     
       4. The communication system according to  claim 2 , wherein time resources are allocated for communication with the base station governing the first cell and for communication with the base station governing the second cell, based on respective amounts of traffic of the downlink data and the uplink data. 
     
     
       5. The communication system according to  claim 2 , wherein time resources are allocated for communication with the base station governing the first cell and for communication with the base station governing the second cell, based on a ratio of the respective amounts of traffic of the downlink data and the uplink data. 
     
     
       6. The communication system according to  claim 2 , wherein
 the base station governing the first cell notifies the base station governing the second cell, of wireless resources allocated for control information that is received from the terminal apparatus and for transmitting the downlink data, and 
 the base station governing the second cell allocates for communication of the base station governing the second cell, wireless resources that are different from a time resource notified by the base station governing the first cell. 
 
     
     
       7. The communication system according to  claim 2 , wherein
 the base station governing the second cell notifies the base station governing the first cell, of wireless resources allocated for control information that is received from the terminal apparatus and for receiving the uplink data, and 
 the base station governing the first cell allocates for communication of the base station governing the first cell, wireless resources that are different from a time resource notified by the base station governing the second cell. 
 
     
     
       8. The communication system according to  claim 2 , wherein
 the terminal apparatus measures communication timing of the base station governing the first cell and communication timing of the base station governing the second cell, and 
 the base station governing the first cell and the base station governing the second cell allocate for communication of the base station governing the first cell and the base station governing the second cell, respectively, time resources such that a guard time that is based on the timings measured by terminal apparatus is obtained. 
 
     
     
       9. A communication method of a terminal apparatus, the communication method comprising:
 measuring downlink interference power for each wireless frame into which wireless resources are time divided; 
 downlink communicating involving receiving downlink data via a base station governing a first cell and exchanging with the base station governing the first cell, control information that is for receiving the downlink data; and 
 uplink communicating involving transmitting uplink data via a base station governing a second cell that is different from the first cell and exchanging with the base station governing the second cell, control information that is for transmitting the uplink data, wherein 
 communication is switched between a downlink transceiver receiving a downlink control information, downlink data, and uplink control information and an uplink transceiver transmitting uplink control information, uplink data and downlink control information according to time division, 
 wherein time resources are allocated for communication with the base station governing the first cell and for communication with the base station governing the second cell, based on interference power of communication by the base station governing the first cell and interference power of communication by the base station governing the second cell.